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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 11,487 $ 5,598
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,626 8,455
Deferred income taxes 1,719 1,798
Gain on the sale of property, plant and equipment (2) (68)
Asset impairment 39  
Stock-based compensation expense 1,553 1,276
Excess tax shortfall (benefit) from stock-based compensation (114) 1
Changes in operating assets and liabilities:    
Accounts receivable 40,218 (48,927)
Inventories 3,141 (11,377)
Prepaid expenses and other assets 6,129 10,680
Accounts payable (8,786) 15,877
Accrued liabilities (12,609) (3,531)
Income taxes (3,753) (3,603)
Net cash provided by (used in) operations 48,648 (23,821)
Cash flows from investing activities:    
Proceeds from sales and redemptions of investments 25 25
Additions to property, plant and equipment (6,703) (11,554)
Proceeds from the sale of property, plant and equipment 22 72
Additions to purchased software (217) (394)
Thailand flood property insurance proceeds   9,966
Net cash used in investing activities (6,873) (1,885)
Cash flows from financing activities:    
Proceeds from stock options exercised 3,321 1,365
Excess tax (shortfall) benefits from stock-based compensation 114 (1)
Principal payments on capital lease obligations (112) (94)
Share repurchases (12,078) (3,935)
Net cash used in financing activities (8,755) (2,665)
Effect of exchange rate changes (745) 1,119
Net increase (decrease) in cash and cash equivalents 32,275 (27,252)
Cash and cash equivalents at beginning of year 384,579 283,920
Cash and cash equivalents at end of period $ 416,854 $ 256,668